A book, the first day read 20 pages, the second day read 14, two days read a total of 45 pages?

A: this book has 100 pages

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1. A freight car and a passenger car leave from Jiaji and meet each other in 4 hours. It takes 12 hours for the train to complete the whole journey, and how many hours for the passenger car?
2. The original speed of a car is 30 km / h, now it starts to accelerate evenly, increasing by 204 km / h; a car? A The original driving speed of a car is 30 km / h, and now it starts to accelerate evenly, increasing the speed by 204 km / h per hour; the original driving speed of a car is 90 km / h, and now it starts to decelerate evenly, decelerating by 10 km / h per hour. After how long, the speed of the cars is the same? What is the speed at this time?
3. The diameter of a car's outer tire is 9 decimeters, and the wheels roll 1000 cycles per minute. How long does this car advance per hour?
4. The distance between the two places is 360km, and they meet in two hours. The speed ratio is 5:4. How many meters are there in each line?
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9. Imaginary part of complex 1-I / (1 + I) 2
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12. One number in the first bracket, two in the second bracket, three in the third bracket and one in the fourth bracket The cycle is divided into (1), (3, 5), (7, 9, 11), (13), (15, 17), (19, 21, 23), (25) Then the sum of the numbers in the 50th bracket is () A. 390B. 392C. 394D. 396
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